Concave bubble bat



FIG. 1 is a front elevational view of the concave bubble bat showing ournew design, the rear elevational, right and left side views beingidentical;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof; and,

FIG. 4 is a perspective view thereof.

The ornamental design for a concave bubble bat, as shown and described. 